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Which expression is the best estimate of the product of [tex]\(\frac{7}{8}\)[/tex] and [tex]\(8 \frac{1}{10}\)[/tex]?

A. [tex]\(0 \times 8\)[/tex]

B. [tex]\(1 \times 10\)[/tex]

C. [tex]\(7 \times 8\)[/tex]

D. [tex]\(1 \times 8\)[/tex]


Sagot :

Sure, let's go through the process of estimating the product of [tex]\(\frac{7}{8}\)[/tex] and [tex]\(8 \frac{1}{10}\)[/tex] step-by-step:

### Step 1: Understanding the Fractions

First, let's analyze the given fractions:
1. [tex]\(\frac{7}{8}\)[/tex]
2. [tex]\(8 \frac{1}{10}\)[/tex]

### Step 2: Converting the Mixed Number

Next, we need to convert the mixed number [tex]\(8 \frac{1}{10}\)[/tex] into an improper fraction:
[tex]\[ 8 \frac{1}{10} = 8 + \frac{1}{10} = \frac{80}{10} + \frac{1}{10} = \frac{81}{10} \][/tex]

### Step 3: Calculating the Product

Now, we calculate the exact product of [tex]\(\frac{7}{8}\)[/tex] and [tex]\(\frac{81}{10}\)[/tex]:
[tex]\[ \text{Product} = \frac{7}{8} \times \frac{81}{10} = \frac{7 \times 81}{8 \times 10} = \frac{567}{80} \approx 7.09 \][/tex]

### Step 4: Rounding and Estimate

To estimate, we will round each fraction to the nearest whole number:
- [tex]\(\frac{7}{8}\)[/tex] rounds to [tex]\(1\)[/tex] because it is closer to [tex]\(1\)[/tex] than [tex]\(0\)[/tex].
- [tex]\(\frac{81}{10}\)[/tex] (which is [tex]\(8.1\)[/tex]) rounds to [tex]\(8\)[/tex] because it is closer to [tex]\(8\)[/tex] than [tex]\(10\)[/tex].

### Step 5: Calculating the Estimated Product

Using the rounded values, we multiply:
[tex]\[ \text{Estimated Product} = 1 \times 8 = 8 \][/tex]

### Step 6: Selecting the Best Estimate

Given the choices:
- [tex]\( 0 \times 8 = 0 \)[/tex]
- [tex]\( 1 \times 10 = 10 \)[/tex]
- [tex]\( 7 \times 8 = 56 \)[/tex]
- [tex]\( 1 \times 8 = 8 \)[/tex]

Among these options, the expression [tex]\(1 \times 8\)[/tex] provides the best estimate for the actual product, which we have calculated to be approximately [tex]\(7.09\)[/tex].

Therefore, the best estimate of the product of [tex]\(\frac{7}{8}\)[/tex] and [tex]\(8 \frac{1}{10}\)[/tex] is:
[tex]\[ 1 \times 8 \][/tex]